20121004012 has 6 divisors (see below), whose sum is σ = 35211757028. Its totient is φ = 10060502004.

The previous prime is 20121003983. The next prime is 20121004019. The reversal of 20121004012 is 21040012102.

It is a happy number.

It is a super-2 number, since 2×20121004012² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20121003983 and 20121004001.

It is not an unprimeable number, because it can be changed into a prime (20121004019) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2515125498 + ... + 2515125505.

Almost surely, 2^20121004012 is an apocalyptic number.

It is an amenable number.

20121004012 is a deficient number, since it is larger than the sum of its proper divisors (15090753016).

20121004012 is a wasteful number, since it uses less digits than its factorization.

20121004012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5030251007 (or 5030251005 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 20121004012 its reverse (21040012102), we get a palindrome (41161016114).

The spelling of 20121004012 in words is "twenty billion, one hundred twenty-one million, four thousand, twelve".